I cannot install update "Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update (KB951847) x64". Windows Update encounters a reportedly unknown error code 643 and the update fails. How can I fix this? PS: I am running Microsoft Windows Vista 64-bit (ENU) with Service Pack 2 (SP2) on an HP Pavilion dv5-1199eg Entertainment Notebook PC.

Thank you for your reply. I have performed these steps and they did not repair the problem. As such, I have unproposed your post as answer. Thank you for your input anyway, it might work for others. PS: You should not post e-mail addresses on the Internet, especially if they are not yours. Please edit your post and delete any e-mail addresses. Thank you. I didn't post a private e-mail address. I posted a public e-mail that belongs to Microsoft in a Microsoft forum. Microsoft Mods have already read it and recommended it...so thank you too. No, you didn't post a private e-mail address, you posted a confidential professional e-mail address that belongs to a Microsoft employee on the Internet for which AFAIK you have no consent or permission to publicly post. The e-mail address is not public, AFAIK it's not posted on any official Microsoft website or webpage. If "Microsoft Mods" recommended anything it was probably the content of your message in general, not the posting of the e-mail address... so thank you again for your valuable input and keep the e-mail address if you want, I don't mind it myself, I was just trying to help, but what you're doing is wrong, don't complain if you get problems. so as i was trolling this post . i noticed a bitter person claming to be help full . what i truly see is a person trying to be spitefull. "i didnt work for me so i wish doom on you " i am shure micro soft has bigger isues than who is not useing the right e-mail address for forum postings . mister zhao brought good info to this post and it might have helped more that we will ever know . so dont go pointing littel flaws just so you can feel better about yer self . tisk tisk

i had this problem all week . wed log on update and my game dosent work . so i been playing with HOW TO FIX IT FOR a few days now . so heres my problem i deleted all the frame works . then i installed 2-3.5 did all the steps jamesa1946 recomended . now i need to download frame woks 1.0 and 1.1 . when i do download they lock up any one got any ideas . jamesa1946 thank you for that post . there was a point where i couldnt even load 2-3.5

Ok, so does anyone have a suggestion for a 32 bit system? i have tried all of the above suggestions that are relevant to my system. i have a 32 bit vista home premium on a dell computer. has anyone figured out what else can be done to get these service packs to install properly. i still have an empty windows features box, so i cant turn off my windows features to do an in place upgrade. I suggest you (and everyone else for whom the above-mentioned steps do not fix the issue) to contact a Microsoft support professional by e-mail using the following link: https://support.microsoft.com/oas/default.aspx?&c1=509&gprid=6527&&st=1 . Good luck and please keep us posted.

Ok, so does anyone have a suggestion for a 32 bit system? i have tried all of the above suggestions that are relevant to my system. i have a 32 bit vista home premium on a dell computer. has anyone figured out what else can be done to get these service packs to install properly. i still have an empty windows features box, so i cant turn off my windows features to do an in place upgrade.

Error Code: 643 (Can't install KB951847)

Answer accepted by question author

Anonymous

I received the following Microsoft fix today.

I have been receiving instructions from a Microsoft Tech since last Thursday.

Some of you are likely seeing a Windows Update icon in your system tray right now. DONOT download those updates until you have done the following listed below.

Be sure to follow the instructions carefully. This fix repaired my problem and I was able to download all the new .net framework security updates successfully.

This applies to those using Windows XP and it repaired the problem:

I understand that the following 2 updates still cannot be installed. The error code 0x645 is received.

Microsoft .NET Framework 2.0 Service Pack 2 Security Update for Windows 2000, Windows Server 2003, and

Windows XP (KB974417)

Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Update for .NET versions 2.0 through 3.5 (KB951847) x86

In order to narrow down the cause of this issue and resolve it, please refer to the following steps.

Step 1: Use .Net Framework CleanUp Utility

============================================

Please download the .NET Framework Cleanup Tool from the following link:

http://windowsuu.com/tools/dotnetfx\_cleanup\_tool.zip

Please Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Unzip the file and then close all the open windows.
Double click Cleanup_tool.exe to run it, and then select the .Net Framework 2.0 in the list box. Click “OK”, click “Yes”, and click “Cleanup Now” to remove it completely. After that, please also remove the .NET 3.5.

Step 2: Reinstall .NET Framework Version 2.0, 3.5 and their updates

==================================================

Please download and install the following updates in order.

Microsoft .NET Framework Version 2.0 Redistributable Package (x86)

http://download.microsoft.com/download/5/6/7/567758a3-759e-473e-bf8f-52154438565a/dotnetfx.exe

Microsoft .NET Framework 2.0 Service Pack 2

http://download.microsoft.com/download/c/6/e/c6e88215-0178-4c6c-b5f3-158ff77b1f38/NetFx20SP2\_x86.exe

Microsoft .NET Framework 2.0 Service Pack 2 Security Update for Windows 2000, Windows Server 2003, and Windows XP (KB974417)

http://download.microsoft.com/download/A/0/1/A01064A3-CAB0-4851-9C54-56A980FF00EB/NDP20SP2-KB974417-x86.exe

After that, please restart the computer and then install Microsoft .NET Framework 3.5 and its update.

Microsoft .NET Framework 3.5 and .NET Framework 3.5 Service Pack 1

http://download.microsoft.com/download/2/0/E/20E90413-712F-438C-988E-FDAA79A8AC3D/dotnetfx35.exe

Microsoft .NET Framework 3.5 Family Update

http://download.microsoft.com/download/C/6/A/C6ADC586-2518-404B-8973-E1E22C556AF4/NDP35SP1-KB958484-x86.exe

Note: When the file download window appears, please click "Save", and follow the directions to save it on the Desktop. After downloading the setup file on your Desktop, double-click to manually install it.

However, if any error is encountered when installing, please capture a screenshot of the error message:

How to capture a Screenshot:

======================

When the error appears, please press the "Print Screen" key (PrtScn) on your keyboard.
Click "Start", click "Run", type MSPAINT, and click "OK".
In Paint, click "Paste" under the "Edit" Menu, click "Save" under the "File" menu, type a file name for the screenshot, choose JPEG as "Save as type", click "Desktop" on the left pane, and click "Save".
Please find the screenshot on the Desktop and send it as an attachment to: *** Email address is removed for privacy ***.

Please try my suggestions and let me know the results at your earliest convenience. If you have any other questions, please do not hesitate to let me know.

I look forward to your response.

Best Regards,

William Zhao

*** Email address is removed for privacy ***

Microsoft Windows Update Support Professional

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Error Code: 643 (Can't install KB951847)

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